Any penalty for late submission of tax return as amendemet

For one of our client, we did submit 2011-12 tax return on May-12. Just now we have discovered a mistake in his return. If we will submit amended tax return in Feb-13, will there be a late filing penalty and any other penalty e.g. 30% due to failure to take reasonable care and interest on unpaid tax. 

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ACDWebb |
ACDWebb's picture

Thanks for your help.  

usman |